/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

class Color { };
class Animal {
  color: Color;

  constructor(color: Color) {
    this.color = color;
  }

  makeSound() {}
}

class Dog extends Animal {
  constructor(color: Color) {
    super(color);
  }

  getColor(): Color {
    return this.color;
  }
}

class Cat extends Animal {
  constructor(color: Color) {
    super(color);
  }
}

function main() {
    const c = new Color();
    const dog = new Dog(c);
    let dc = dog.getColor();
}